Add audio input channels env

docs/install_application.md

@@ -179,6 +179,7 @@ Environment=PREFERENCES_FILE="/home/pi/linux-voice-assistant/preferences.json"
 # Environment=MIC_VOLUME="1.0"
 # Environment=MIC_AUTO_GAIN="0"
 # Environment=MIC_NOISE_SUPPRESSION="0"
+# Environment=AUDIO_INPUT_CHANNELS=2
 # Environment=ENABLE_THINKING_SOUND="1"
 # Environment=WAKE_WORD_DIR="app/wakewords"
 # Environment=WAKE-MODEL="okay_nabu"
@@ -261,6 +262,7 @@ The following variables can be configured in the `.env` or in the service file:
 | `MIC_VOLUME` | Control microphone volume | 100 |
 | `MIC_AUTO_GAIN` | Add WebRTC Gain to Mic | 0 |
 | `MIC_NOISE_SUPPRESSION` | Add WebRTC Noise Suppresion to Mic | 0 |
+| `AUDIO_INPUT_CHANNELS` | Number of audio input channels | 2 |
 | `ENABLE_THINKING_SOUND` | false | Set to "1" to enable thinking sound |
 | `WAKE_WORD_DIR` | `app/wakewords` | Path to the wake word directory |
 | `WAKE_MODEL` | `okay_nabu` | Wake word model to use |